Properties and Benefits: Claw hammers can be constructed many ways but generally come in one of two forms. The first, and most popular, type of hammer is the two piece hammer. This hammer is constructed from a forged steel head with a hole for fixing a handle. One end is made to fit the hole in the hammer head, then a steel wedge is driven into the wood which forces it to expand and secure the hammer head to the handle. Other handle materials include glass fibre and even carbon fiber.